Collocations for unreasonable - adj.

appear, be, seem, sound
She did not want to appear unreasonable.

become, get
His demands were becoming more and more unreasonable.

consider sth, deem sth, find sb/sth, hold sth (to be) (law), judge sth (law), regard sth as (esp. BrE), think sth
I find her a little unreasonable at times.
This clause in the contract was held unreasonable.

extremely, very
completely, entirely, quite, totally, utterly, wholly
a little, slightly, etc.
apparently

about
He was totally unreasonable about it.

Unreasonable is used with these nouns:
demand, expectation, fear, request, risk